Order this document by MC13155/D The MC13155 is a complete wideband FM detector designed for satellite TV and other wideband data and analog FM applications. This device may be cascaded for higher IF gain and extended Receive Signal Strength Indicator (RSSI) range. • 12 MHz Video/Baseband Demodulator • • • • • WIDEBAND FM IF Ideal for Wideband Data and Analog FM Systems Limiter Output for Cascade Operation SEMICONDUCTOR TECHNICAL DATA Low Drain Current: 7.0 mA Low Supply Voltage: 3.0 to 6.0 V Operates to 300 MHz MAXIMUM RATINGS 16 Rating Pin Symbol Value Unit Power Supply Voltage 11, 14 VEE (max) 6.5 Vdc Input Voltage 1, 16 Vin 1.0 Vrms Junction Temperature – TJ +150 °C Storage Temperature Range – Tstg – 65 to +150 °C NOTE: 1 D SUFFIX PLASTIC PACKAGE CASE 751B (SO–16) Devices should not be operated at or outside these values. The “Recommended Operating Conditions” provide for actual device operation. PIN CONNECTIONS Figure 1. Representative Block Diagram Buffered RSSI Decouple Output 15 13 RSSI Output 12 Limiter Output 10 16 9 Input 1 Three Stage Amplifier Quad Coil Detector Input Input 1 16 Input Decouple 2 15 Decouple VCC1 3 14 VEE1 Output 4 13 RSSI Buffer Output 5 12 RSSI VCC2 6 11 VEE2 Limiter Out 7 10 Limiter Out Quad Coil 8 9 Quad Coil 8 2 Decouple 4 5 Balanced Outputs (Top View) 7 Limiter Output NOTE: This device requires careful layout and decoupling to ensure stable operation. ORDERING INFORMATION Device Operating Temperature Range Package MC13155D TA = – 40 to +85°C SO–16 Motorola, Inc. 1996 MOTOROLA ANALOG IC DEVICE DATA Rev 1 1 MC13155 RECOMMENDED OPERATING CONDITIONS Rating Pin Symbol Value Unit Power Supply Voltage (TA= 25°C) – 40°C ≤ TA ≤ 85°C 11, 14 3, 6 VEE VCC – 3.0 to – 6.0 Grounded Vdc Maximum Input Frequency 1, 16 fin 300 MHz – TJ – 40 to + 85 °C Ambient Temperature Range DC ELECTRICAL CHARACTERISTICS (TA = 25°C, no input signal.) Characteristic Drain Current (VEE = – 5.0 Vdc) (VEE = – 5.0 Vdc) Drain Current Total (see Figure 3) (VEE = – 5.0 Vdc) (VEE = – 6.0 Vdc) (VEE = – 3.0 Vdc) Pin Symbol Min Typ Max Unit 11 14 14 I11 I14 I14 2.0 3.0 3.0 2.8 4.3 4.3 4.0 6.0 6.0 mA 11, 14 ITotal 5.0 5.0 5.0 4.7 7.1 7.5 7.5 6.6 10 10.5 10.5 9.5 mA AC ELECTRICAL CHARACTERISTICS (TA = 25°C, fIF = 70 MHz, VEE = – 5.0 Vdc Figure 2, unless otherwise noted.) Pin Min Typ Max Unit Input for – 3 dB Limiting Sensitivity 1, 16 – 1.0 2.0 mVrms Differential Detector Output Voltage (Vin = 10 mVrms) (fdev = ± 3.0 MHz) (VEE = – 6.0 Vdc) (VEE = – 5.0 Vdc) (VEE = – 3.0 Vdc) 4, 5 470 450 380 590 570 500 700 680 620 Detector DC Offset Voltage 4, 5 – 250 – 250 mVdc RSSI Slope 13 1.4 2.1 2.8 µA/dB RSSI Dynamic Range 13 31 35 39 dB RSSI Output (Vin = 100 µVrms) (Vin = 1.0 mVrms) (Vin = 10 mVrms) (Vin = 100 mVrms) (Vin = 500 mVrms) 12 – – 16 – – 2.1 2.4 24 65 75 – – 36 – – RSSI Buffer Maximum Output Current (Vin = 10 mVrms) 13 – 2.3 – Differential Limiter Output (Vin = 1.0 mVrms) (Vin = 10 mVrms) 7, 10 100 – 140 180 – – Demodulator Video 3.0 dB Bandwidth 4, 5 – 12 – MHz Input Impedance (Figure 14) @ 70 MHz Rp (VEE = – 5.0 Vdc) @ 70 MHz Cp (C2=C15 = 100 p) 1, 16 – – 450 4.8 – – Ω pF – 46 – dB Characteristic Differential IF Power Gain NOTE: 2 mVp–p µA mAdc mVrms 1, 7, 10, 16 Positive currents are out of the pins of the device. MOTOROLA ANALOG IC DEVICE DATA MC13155 CIRCUIT DESCRIPTION The MC13155 consists of a wideband three–stage limiting amplifier, a wideband quadrature detector which may be operated up to 200 MHz, and a received signal strength indicator (RSSI) circuit which provides a current output linearly proportional to the IF input signal level for approximately 35 dB range of input level. Figure 2. Test Circuit 1.0n Vin 1.0n 1 IN1 49.9 Video Output 27 IN2 16 10n 2 DEC1 DEC2 15 3 VCC1 VEE1 14 4 DETO1 RSSI 13 Buffer 5 DETO2 RSSI 12 6 VCC2 VEE2 11 100n 1.0n 10µ VEE + 1.0k Limiter 1 Output 7 LIMO1 100n 1.0n 1.0n QUAD2 9 8 QUAD1 10µ VEE + Limiter 2 Output LIMO2 10 1.0n 330 VEE 1.0n 330 499 20p L1 L1 – Coilcraft part number 146–09J08S 260n APPLICATIONS INFORMATION Evaluation PC Board The evaluation PCB shown in Figures 19 and 20 is very versatile and is designed to cascade two ICs. The center section of the board provides an area for attaching all surface mount components to the circuit side and radial leaded components to the component ground side of the PCB (see Figures 17 and 18). Additionally, the peripheral area surrounding the RF core provides pads to add supporting and interface circuitry as a particular application dictates. This evaluation board will be discussed and referenced in this section. Limiting Amplifier Differential input and output ports interfacing the three stage limiting amplifier provide a differential power gain of typically 46 dB and useable frequency range of 300 MHz. The IF gain flatness may be controlled by decoupling of the internal feedback network at Pins 2 and 15. MOTOROLA ANALOG IC DEVICE DATA Scattering parameter (S–parameter) characterization of the IF as a two port linear amplifier is useful to implement maximum stable power gain, input matching, and stability over a desired bandpass response and to ensure stable operation outside the bandpass as well. The MC13155 is unconditionally stable over most of its useful operating frequency range; however, it can be made unconditionally stable over its entire operating range with the proper decoupling of Pins 2 and 15. Relatively small decoupling capacitors of about 100 pF have a significant effect on the wideband response and stability. This is shown in the scattering parameter tables where S–parameters are shown for various values of C2 and C15 and at VEE of – 3.0 and – 5.0 Vdc. 3 MC13155 TYPICAL PERFORMANCE AT TEMPERATURE (See Figure 2. Test Circuit) Figure 4. RSSI Output versus Frequency and Input Signal Level 10 ITotal = I14 + I11 6.0 I14 4.0 – 30 dBm – 40 dBm 1.0 2.0 3.0 4.0 5.0 6.0 7.0 0 10 8.0 Figure 5. Total Drain Current versus Ambient Temperature and Supply Voltage Figure 6. Detector Drain Current and Limiter Drain Current versus Ambient Temperature 5.5 8.5 – 5.0 Vdc VEE = – 6.0 Vdc 8.0 7.5 7.0 – 3.0 Vdc 6.5 6.0 5.5 – 30 –10 10 30 50 70 90 5.0 f = 70 MHz VEE = – 5.0 Vdc I14 4.5 4.0 3.5 I11 3.0 2.5 2.0 – 50 110 – 30 –10 10 30 50 70 90 TA, AMBIENT TEMPERATURE (°C) TA, AMBIENT TEMPERATURE (°C) Figure 7. RSSI Output versus Ambient Temperature and Supply Voltage Figure 8. RSSI Output versus Input Signal Voltage (Vin at Temperature) 110 100 VEE = – 6.0 Vdc 24.0 23.5 VEE = – 5.0 Vdc 22.5 I I VEE = – 3.0 Vdc 22.0 – 30 –10 10 30 50 70 TA, AMBIENT TEMPERATURE (°C) 90 TA = + 85°C 80 + 25°C 60 – 40°C 40 12 23.0 21.5 – 50 1000 f, FREQUENCY (MHz) 9.0 5.0 – 50 100 VEE, SUPPLY VOLTAGE (–Vdc) , RSSI OUTPUT ( µ A) , RSSI OUTPUT ( µ A) – 20 dBm 40 20 24.5 12 –10 dBm 60 2.0 25.0 4 VEE = – 5.0Vdc 0 dBm 80 I 12 , RSSI OUTPUT ( µ A) 8.0 0.0 0.0 I 11 and I 14 , TOTAL DRAIN CURRENT (mAdc) 100 TA = 25°C I 14 and I 11, DRAIN CURRENT (mAdc) I14 and I Total , DRAIN CURRENT (mAdc) Figure 3. Drain Current versus Supply Voltage 110 20 0 0.1 1.0 10 100 1000 Vin, INPUT VOLTAGE (mVrms) MOTOROLA ANALOG IC DEVICE DATA Figure 9. Differential Detector Output Voltage versus Ambient Temperature and Supply Voltage 750 Figure 10. Differential Limiter Output Voltage versus Ambient Temperature (Vin = 1 and 10 mVrms) DIFFERENTIAL LIMITER OUTPUT VOLTAGE (Pins 7, 10), (mVrms) DIFFERENTIAL DETECTOR OUTPUT VOLTAGE (Pins 4, 5), (mVpp ) MC13155 VEE = – 6.0 Vdc 700 – 5.0 Vdc 650 – 3.0 Vdc 600 550 500 450 400 350 – 50 – 30 –10 10 30 50 70 90 110 220 f = 70 MHz VEE = – 5.0 Vdc 200 180 160 Vin = 1.0 mVrms 140 120 – 50 – 30 TA, AMBIENT TEMPERATURE (°C) f dev = ± 6.0 MHz ± 5.0 MHz ± 4.0 MHz 800 ± 3.0 MHz 600 ± 2.0 MHz 400 ± 1.0 MHz 200 2.0 2.5 3.0 3.5 4.0 4.5 10 30 50 70 90 Figure 11B. Differential Detector Output Voltage versus Q of Quadrature LC Tank DIFFERENTIAL DETECTOR OUTPUT (mVpp ) DIFFERENTIAL DETECTOR OUTPUT (mVpp ) 1600 0 1.5 –10 TA, AMBIENT TEMPERATURE (°C) Figure 11A. Differential Detector Output Voltage versus Q of Quadrature LC Tank Vin = – 30 dBm 1400 VEE = – 5.0 Vdc fc = 70 MHz 1200 fmod = 1.0 MHz (Figure 16 no external capacitors 1000 between Pins 7, 8 and 9, 10) Vin = 10 mVrms 5.0 5.5 6.0 2400 Vin = – 30 dBm VEE = – 5.0 Vdc 2000 fc = 70 MHz fmod = 1.0 MHz 1600 (Figure 16 no external capacitors between Pins 7, 8 and 9, 10) f dev = ± 6.0 MHz ± 5.0 MHz ± 4.0 MHz 1200 ± 3.0 MHz 800 ± 2.0 MHz 400 ± 1.0 MHz 0 1.5 2.0 2.5 Q OF QUADRATURE LC TANK 3.0 3.5 4.0 4.5 5.0 5.5 6.0 Q OF QUADRATURE LC TANK Figure 11. Figure 13. – S+N, N versus IF Input Figure 12. RSSI Output Voltage versus IF Input – 1.0 VEE = – 5.0 Vdc fc = 70 MHz (See Figure 16) 10 Capacitively coupled interstage: no attenuation S+N 0 –10 – 2.0 15 dB Interstage Attenuator – 3.0 – 4.0 S+N, N (dB) RSSI OUTPUT VOLTAGE, (Vdc) 0 – 20 – 30 – 40 – 50 – 5.0 – 80 – 60 – 60 – 40 – 20 IF INPUT, (dBm) MOTOROLA ANALOG IC DEVICE DATA 0 20 – 70 – 90 fc = 70 MHz fmod = 1.0 MHz fdev = ± 5.0 MHz VEE = – 5.0 Vdc – 70 N – 50 – 30 –10 10 IF INPUT (dBm) 5 MC13155 In the S–parameters measurements, the IF is treated as a two–port linear class A amplifier. The IF amplifier is measured with a single–ended input and output configuration in which the Pins 16 and 7 are terminated in the series combination of a 47 Ω resistor and a 10 nF capacitor to VCC ground (see Figure 14. S–Parameter Test Circuit). The S–parameters are in polar form as the magnitude (MAG) and angle (ANG). Also listed in the tables are the calculated values for the stability factor (K) and the Maximum Available Gain (MAG). These terms are related in the following equations: K = (1– IS11 I2 – I S22 I2 + I ∆ I2 ) / ( 2 I S12 S21 I ) where: I ∆ I = I S11 S22 – S12 S21 I. MAG = 10 log I S21 I / I S12 I + 10 log I K – ( K2 – 1)1/2 I where: K > 1. The necessary and sufficient conditions for unconditional stability are given as K > 1: B1 = 1 + I S11 I2 – I S22 I2 – I ∆ I2 > 0 Figure 14. S–Parameter Test Circuit IF Input SMA 1.0n 1.0n 1 IN1 47 IN2 16 C2 C15 2 DEC1 DEC2 15 3 VCC1 VEE1 14 4 DETO1 RSSI 13 Buffer 5 DETO2 RSSI 12 6 VCC2 VEE2 11 7 LIMO1 LIMO2 10 8 QUAD1 QUAD2 9 VEE 1.0n 100n 10µ + SMA 1.0n 47 6 1.0n IF Output MOTOROLA ANALOG IC DEVICE DATA MC13155 S–Parameters (VEE = – 5.0 Vdc, TA = 25°C, C2 and C15 = 0 pF) Frequency Input S11 Forward S21 Rev S12 Output S22 K MAG MHz MAG ANG MAG ANG MAG ANG MAG ANG MAG dB 1.0 0.94 –13 8.2 143 0.001 7.0 0.87 – 22 2.2 32 2.0 0.78 – 23 23.5 109 0.001 – 40 0.64 – 31 4.2 33.5 5.0 0.48 1.0 39.2 51 0.001 – 97 0.34 –17 8.7 33.7 7.0 0.59 15 40.3 34 0.001 – 41 0.33 –13 10.6 34.6 10 0.75 17 40.9 19 0.001 – 82 0.41 –1.0 5.7 36.7 20 0.95 7.0 42.9 – 6.0 0.001 – 42 0.45 0 1.05 46.4 50 0.98 –10 42.2 – 48 0.001 – 9.0 0.52 – 3.0 0.29 – 70 0.95 –16 39.8 – 68 0.001 112 0.54 –16 1.05 46.4 100 0.93 – 23 44.2 – 93 0.001 80 0.53 – 22 0.76 – 150 0.91 – 34 39.5 –139 0.001 106 0.50 – 34 0.94 – 200 0.87 – 47 34.9 –179 0.002 77 0.42 – 44 0.97 – 500 0.89 –103 11.1 – 58 0.022 57 0.40 –117 0.75 – 700 0.61 –156 3.5 –164 0.03 0 0.52 179 2.6 13.7 900 0.56 162 1.2 92 0.048 – 44 0.47 112 4.7 4.5 1000 0.54 131 0.8 42 0.072 – 48 0.44 76 5.1 0.4 K MAG S–Parameters (VEE = – 5.0 Vdc, TA = 25°C, C2 and C15 = 100 pF) Frequency Input S11 Forward S21 Rev S12 Output S22 MHz MAG ANG MAG ANG MAG ANG MAG ANG MAG dB 1.0 0.98 –15 11.7 174 0.001 –14 0.84 – 27 1.2 37.4 2.0 0.50 – 2.0 39.2 85.5 0.001 –108 0.62 – 35 6.0 35.5 5.0 0.87 8.0 39.9 19 0.001 100 0.47 – 9.0 4.2 39.2 7.0 0.90 5.0 40.4 9.0 0.001 – 40 0.45 – 8.0 3.1 40.3 10 0.92 3.0 41 1.0 0.001 – 40 0.44 – 5.0 2.4 41.8 20 0.92 – 2.0 42.4 –14 0.001 – 87 0.49 – 6.0 2.4 41.9 50 0.91 – 8.0 41.2 – 45 0.001 85 0.50 – 5.0 2.3 42 70 0.91 –11 39.1 – 63 0.001 76 0.52 – 4.0 2.2 41.6 100 0.91 –15 43.4 – 84 0.001 85 0.50 –11 1.3 43.6 150 0.90 – 22 38.2 –126 0.001 96 0.43 – 22 1.4 41.8 200 0.86 – 33 35.5 –160 0.002 78 0.43 – 21 1.3 39.4 500 0.80 – 66 8.3 – 9.0 0.012 75 0.57 – 63 1.7 23.5 700 0.62 – 96 2.9 – 95 0.013 50 0.49 –111 6.3 12.5 900 0.56 –120 1.0 –171 0.020 53 0.44 –150 13.3 2.8 1000 0.54 –136 0.69 154 0.034 65 0.44 –179 12.5 – 0.8 MOTOROLA ANALOG IC DEVICE DATA 7 MC13155 S–Parameters (VEE = – 5.0 Vdc, TA = 25°C, C2 and C15 = 680 pF) Frequency Input S11 Forward S21 Rev S12 Output S22 K MAG MHz MAG ANG MAG ANG MAG ANG MAG ANG MAG dB 1.0 0.74 4.0 53.6 110 0.001 101 0.97 – 35 0.58 – 2.0 0.90 3.0 70.8 55 0.001 60 0.68 – 34 1.4 45.6 5.0 0.91 0 87.1 21 0.001 –121 0.33 – 60 1.1 49 7.0 0.91 0 90.3 11 0.001 –18 0.25 – 67 1.2 48.4 10 0.91 – 2.0 92.4 2.0 0.001 33 0.14 – 67 1.5 47.5 20 0.91 – 4.0 95.5 –16 0.001 63 0.12 –15 1.3 48.2 50 0.90 – 8.0 89.7 – 50 0.001 – 43 0.24 26 1.8 46.5 70 0.90 –10 82.6 –70 0.001 92 0.33 21 1.4 47.4 100 0.91 –14 77.12 –93 0.001 23 0.42 –1.0 1.05 49 150 0.94 – 20 62.0 –122 0.001 96 0.42 – 22 0.54 – 200 0.95 – 33 56.9 –148 0.003 146 0.33 – 62 0.75 – 500 0.82 – 63 12.3 –12 0.007 79 0.44 – 67 1.8 26.9 700 0.66 – 98 3.8 –107 0.014 84 0.40 –115 4.8 14.6 900 0.56 –122 1.3 177 0.028 78 0.39 –166 8.0 4.7 1000 0.54 –139 0.87 141 0.048 76 0.41 165 7.4 0.96 K MAG S–Parameters (VEE = – 3.0 Vdc, TA = 25°C, C2 and C15 = 0 pF) Frequency 8 Input S11 Forward S21 Rev S12 Output S22 MHz MAG ANG MAG ANG MAG ANG MAG ANG MAG dB 1.0 0.89 –14 9.3 136 0.001 2.0 0.84 – 27 3.2 30.7 2.0 0.76 – 22 24.2 105 0.001 – 90 0.67 – 37 3.5 34.3 5.0 0.52 5.0 35.7 46 0.001 – 32 0.40 –13 10.6 33.3 7.0 0.59 12 38.1 34 0.001 – 41 0.40 –10 9.1 34.6 10 0.78 15 37.2 16 0.001 – 92 0.40 –1.0 5.7 36.3 20 0.95 5.0 38.2 – 9.0 0.001 47 0.51 – 4.0 0.94 – 50 0.96 –11 39.1 – 50 0.001 –103 0.48 – 6.0 1.4 43.7 70 0.93 –17 36.8 – 71 0.001 – 76 0.52 –13 2.2 41.4 100 0.91 – 25 34.7 – 99 0.001 –152 0.51 –19 3.0 39.0 150 0.86 – 37 33.8 –143 0.001 53 0.49 – 34 1.7 39.1 200 0.81 – 49 27.8 86 0.003 76 0.55 – 56 2.4 35.1 500 0.70 – 93 6.2 – 41 0.015 93 0.40 –110 2.4 19.5 700 0.62 –144 1.9 –133 0.049 56 0.40 –150 3.0 8.25 900 0.39 –176 0.72 125 0.11 –18 0.25 163 5.1 –1.9 1000 0.44 166 0.49 80 0.10 – 52 0.33 127 7.5 – 4.8 MOTOROLA ANALOG IC DEVICE DATA MC13155 S–Parameters (VEE = – 3.0 Vdc, TA = 25°C, C2 and C15 = 100 pF) Frequency Input S11 Forward S21 Rev S12 Output S22 K MAG MHz MAG ANG MAG ANG MAG ANG MAG ANG MAG dB 1.0 0.97 –15 11.7 171 0.001 – 4.0 0.84 – 27 1.4 36.8 2.0 0.53 2.0 37.1 80 0.001 – 91 0.57 – 31 6.0 34.8 5.0 0.88 7.0 37.7 18 0.001 – 9.0 0.48 – 7.0 3.4 39.7 7.0 0.90 5.0 37.7 8.0 0.001 –11 0.49 – 7.0 2.3 41 10 0.92 2.0 38.3 1.0 0.001 – 59 0.51 – 9.0 2.0 41.8 20 0.92 – 2.0 39.6 –15 0.001 29 0.48 – 3.0 1.9 42.5 50 0.91 – 8.0 38.5 – 46 0.001 – 21 0.51 – 7.0 2.3 41.4 70 0.91 –11 36.1 – 64 0.001 49 0.50 – 8.0 2.3 40.8 100 0.91 –15 39.6 – 85 0.001 114 0.52 –13 1.7 37.8 150 0.89 – 22 34.4 –128 0.001 120 0.48 – 23 1.6 40.1 200 0.86 – 33 32 –163 0.002 86 0.40 – 26 1.7 37.8 500 0.78 – 64 7.6 –12 0.013 94 0.46 – 71 1.9 22.1 700 0.64 – 98 2.3 –102 0.027 58 0.42 –109 4.1 10.1 900 0.54 –122 0.78 179 0.040 38.6 0.35 –147 10.0 – 0.14 1000 0.53 –136 0.47 144 0.043 23 0.38 –171 15.4 – 4.52 K MAG S–Parameters (VEE = – 3.0 Vdc, TA = 25°C, C2 and C15 = 680 pF) Frequency Input S11 Forward S21 Rev S12 Output S22 MHz MAG ANG MAG ANG MAG ANG MAG ANG MAG dB 1.0 0.81 3.0 37 101 0.001 –19 0.90 – 32 1.1 43.5 2.0 0.90 2.0 47.8 52.7 0.001 – 82 0.66 – 39 0.72 – 5.0 0.91 0 58.9 20 0.001 104 0.37 – 56 2.3 44 7.0 0.90 –1 60.3 11 0.001 – 76 0.26 – 55 2.04 44 10 0.91 – 2.0 61.8 3.0 0.001 105 0.18 – 52 2.2 43.9 20 0.91 – 4.0 63.8 – 15 0.001 59 0.11 –13 2.0 44.1 50 0.90 – 8.0 60.0 – 48 0.001 96 0.22 33 2.3 43.7 70 0.90 –11 56.5 – 67 0.001 113 0.29 15 2.3 43.2 100 0.91 –14 52.7 – 91 0.001 177 0.36 5.0 2.0 43 150 0.93 – 21 44.5 –126 0.001 155 0.35 –17 1.8 42.7 200 0.90 – 43 41.2 –162 0.003 144 0.17 – 31 1.6 34.1 500 0.79 – 65 7.3 –13 0.008 80 0.44 – 75 3.0 22 700 0.65 – 97 2.3 –107 0.016 86 0.38 –124 7.1 10.2 900 0.56 –122 0.80 174 0.031 73 0.38 –174 12 0.37 1000 0.55 –139 0.52 137 0.50 71 0.41 157 11.3 – 3.4 MOTOROLA ANALOG IC DEVICE DATA 9 MC13155 DC Biasing Considerations The DC biasing scheme utilizes two VCC connections (Pins 3 and 6) and two VEE connections (Pins 14 and 11). VEE1 (Pin 14) is connected internally to the IF and RSSI circuits’ negative supply bus while VEE2 (Pin 11) is connected internally to the quadrature detector’s negative bus. Under positive ground operation, this unique configuration offers the ability to bias the RSSI and IF separately from the quadrature detector. When two ICs are cascaded as shown in the 70 MHz application circuit and provided by the PCB (see Figures 17 and 18), the first MC13155 is used without biasing its quadrature detector, thereby saving approximately 3.0 mA. A total current of 7.0 mA is used to fully bias each IC, thus the total current in the application circuit is approximately 11 mA. Both VCC pins are biased by the same supply. VCC1 (Pin 3) is connected internally to the positive bus of the first half of the IF limiting amplifier, while VCC2 is internally connected to the positive bus of the RSSI, the quadrature detector circuit, and the second half of the IF limiting amplifier (see Figure 15). This distribution of the VCC enhances the stability of the IC. RSSI Circuitry The RSSI circuitry provides typically 35 dB of linear dynamic range and its output voltage swing is adjusted by selection of the resistor from Pin 12 to VEE. The RSSI slope is typically 2.1 µA/dB ; thus, for a dynamic range of 35 dB, the current output is approximately 74 µA. A 47 k resistor will yield an RSSI output voltage swing of 3.5 Vdc. The RSSI buffer output at Pin 13 is an emitter–follower and needs an external emitter resistor of 10 k to VEE. In a cascaded configuration (see circuit application in Figure 16), only one of the RSSI Buffer outputs (Pin 13) is used; the RSSI outputs (Pin 12 of each IC) are tied together and the one closest to the VEE supply trace is decoupled to VCC ground. The two pins are connected to VEE through a 47 k resistor. This resistor sources a RSSI current which is proportional to the signal level at the IF input; typically, 1.0 mVrms (– 47 dBm) is required to place the MC13155 into limiting. The measured RSSI output voltage response of the application circuit is shown in Figure 12. Since the RSSI current output is dependent upon the input signal level at the IF input, a careful accounting of filter losses, matching and other losses and gains must be made in the entire receiver system. In the block diagram of the application circuit shown below, an accounting of the signal levels at points throughout the system shows how the RSSI response in Figure 12 is justified. Block Diagram of 70 MHz Video Receiver Application Circuit Input Level: – 45 dBm 1.26 mVrms – 70 dBm 71 µVrms IF Input – 72 dBm 57 µVrms 16 Saw Filter 1:4 Transformer – 25 dB 2.0 dB (Insertion Loss) (Insertion Loss) – 47 dBm 1.0 mVrms Minimum Input to Acquire Limiting in MC13155 16 10 MC13155 MC13155 7 1 Cascading Stages The limiting IF output is pinned–out differentially, cascading is easily achieved by AC coupling stage to stage. In the evaluation PCB, AC coupling is shown, however, interstage filtering may be desirable in some applications. In which case, the S–parameters provide a means to implement a low loss interstage match and better receiver sensitivity. Where a linear response of the RSSI output is desired when cascading the ICs, it is necessary to provide at least 10 dB of interstage loss. Figure 12 shows the RSSI response with and without interstage loss. A 15 dB resistive attenuator is an inexpensive way to linearize the RSSI response. This has its drawbacks since it is a wideband noise source that is dependent upon the source and load impedance and the amount of attenuation that it provides. A better, although more costly, solution would be a bandpass filter designed to the desired center frequency and bandpass response while carefully selecting the insertion loss. A network topology 10 – 32 dBm 57 µVrms 40 dB Gain 1 –15 dB (Attenuator) 40 dB Gain shown below may be used to provide a bandpass response with the desired insertion loss. Network Topology 1.0n 10 16 0.22µ 7 1 1.0n MOTOROLA ANALOG IC DEVICE DATA MC13155 Quadrature Detector The quadrature detector is coupled to the IF with internal 2.0 pF capacitors between Pins 7 and 8 and Pins 9 and 10. For wideband data applications, such as FM video and satellite receivers, the drive to the detector can be increased with additional external capacitors between these pins, thus, the recovered video signal level output is increased for a given bandwidth (see Figure 11A and Figure 11B). The wideband performance of the detector is controlled by the loaded Q of the LC tank circuit. The following equation defines the components which set the detector circuit’s bandwidth: Q = RT/XL (1) where: RT is the equivalent shunt resistance across the LC Tank and XL is the reactance of the quadrature inductor at the IF frequency (XL = 2πfL). The inductor and capacitor are chosen to form a resonant LC Tank with the PCB and parasitic device capacitance at the desired IF center frequency as predicted by: (2) fc = (2π √(LCp)) –1 where: L is the parallel tank inductor and Cp is the equivalent parallel capacitance of the parallel resonant tank circuit. The following is a design example for a wideband detector at 70 MHz and a loaded Q of 5. The loaded Q of the quadrature detector is chosen somewhat less than the Q of the IF bandpass. For an IF frequency of 70 MHz and an IF bandpass of 10.9 MHz, the IF bandpass Q is approximately 6.4. Example: Let the external Cext = 20 pF. (The minimum value here should be greater than 15 pF making it greater than the internal device and PCB parasitic capacitance, Cint ≈ 3.0 pF). Cp = Cint + Cext = 23 pF Rewrite Equation 2 and solve for L: L = (0.159)2 /(Cp fc2) L = 198 nH, thus, a standard value is chosen. L = 0.22 µH (tunable shielded inductor). MOTOROLA ANALOG IC DEVICE DATA The value of the total damping resistor to obtain the required loaded Q of 5 can be calculated by rearranging Equation 1: RT = Q(2πfL) RT = 5 (2π)(70)(0.22) = 483.8 Ω. The internal resistance, Rint between the quadrature tank Pins 8 and 9 is approximately 3200 Ω and is considered in determining the external resistance, Rext which is calculated from: Rext = ((RT)(Rint))/ (Rint – RT) Rext = 570, thus, choose the standard value. Rext = 560 Ω. SAW Filter In wideband video data applications, the IF occupied bandwidth may be several MHz wide. A good rule of thumb is to choose the IF frequency about 10 or more times greater than the IF occupied bandwidth. The IF bandpass filter is a SAW filter in video data applications where a very selective response is needed (i.e., very sharp bandpass response). The evaluation PCB is laid out to accommodate two SAW filter package types: 1) A five–leaded plastic SIP package. Recommended part numbers are Siemens X6950M which operates at 70 MHz; 10.4 MHz 3 dB passband, X6951M (X252.8) which operates at 70 MHz; 9.2 MHz 3 dB passband; and X6958M which operates at 70 MHz, 6.3 MHz 3 dB passband, and 2) A four–leaded TO–39 metal can package. Typical insertion loss in a wide bandpass SAW filter is 25 dB. The above SAW filters require source and load impedances of 50 Ω to assure stable operation. On the PC board layout, space is provided to add a matching network, such as a 1:4 surface mount transformer between the SAW filter output and the input to the MC13155. A 1:4 transformer, made by Coilcraft and Mini Circuits, provides a suitable interface (see Figures 16, 17 and 18). In the circuit and layout, the SAW filter and the MC13155 are differentially configured with interconnect traces which are equal in length and symmetrical. This balanced feed enhances RF stability, phase linearity, and noise performance. 11 12 Input Input 13 12 RSSI RSSI Buffer 1.0k 1 10p 2 16 1.0k 15 Decouple 3 Bias 8.0k 8.0k VCC 1 Bias 1.0p 6 VEE 2 2.0p 1.6k 7 VCC 2 VEE 1 8 LIM Out 11 2.0p 1.6k 9 Quad Coil 14 10 LIM Out Figure 15. Simplified Internal Circuit Schematic 4 5 Det Out MC13155 Figure 15. MOTOROLA ANALOG IC DEVICE DATA MC13155 Figure 16. 70 MHz Video Receiver Application Circuit If Input 1:4 1 5 SAW Filter 2 3 4 220 SAW Filter is Siemens Part Number X6950M 1.0n 1.0n RSSI Output MC13155 IN2 16 1 IN1 100p 2 DEC1 DEC2 15 3 VCC1 VEE1 14 4 DETO1 RSSI 13 Buffer 5 DETO2 RSSI 12 6 VCC2 VEE2 11 7 LIMO1 LIMO2 10 10k 100p 10n 47k 100n 1.0n 10n QUAD2 8 QUAD1 9 + 10µ VEE1 820 820 820 820 1.0n IN2 16 1 IN1 100p 1.0n MC13155 DEC2 15 2 DEC1 100p 3 VCC1 VEE1 14 4 DETO1 RSSI 13 Buffer 5 DETO2 RSSI 12 6 VCC2 VEE2 11 100n Detector Output 100n 33p 1.0k 33p 1.0k 10n 10n LIMO2 10 7 LIMO1 2.0p QUAD2 8 QUAD1 10µ VEE2 + 2.0p 9 560 20p L L– Coilcraft part number 146–08J08S 0.22µ MOTOROLA ANALOG IC DEVICE DATA 13 MC13155 Figure 17. Component Placement (Circuit Side) Figure 18. Component Placement (Ground Side) 14 MOTOROLA ANALOG IC DEVICE DATA MC13155 Figure 19. Circuit Side View 4.0″ 4.0″ Figure 20. Ground Side View MOTOROLA ANALOG IC DEVICE DATA 15 MC13155 OUTLINE DIMENSIONS D SUFFIX PLASTIC PACKAGE CASE 751B (SO–16) NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSION A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. 751B–03 IS OBSOLETE, NEW STANDARD 751B–04. –A – 16 9 –B – 1 0.25 (0.010) P M B M 8 PL 8 G R X 45° C SEATING PLANE –T – D 16 PL 0.25 (0.010) M T K B A S S M F J DIM A B C D F G J K M P R MILLIMETERS MIN MAX 9.80 10.00 3.80 4.00 1.35 1.75 0.35 0.49 0.40 1.25 1.27 BSC 0.19 0.25 0.10 0.25 0° 7° 5.80 6.20 0.25 0.50 INCHES MIN MAX 0.386 0.393 0.150 0.157 0.054 0.068 0.014 0.019 0.016 0.049 0.050 BSC 0.008 0.009 0.004 0.009 0° 7° 0.229 0.244 0.010 0.019 Motorola reserves the right to make changes without further notice to any products herein. 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Mfax is a trademark of Motorola, Inc. How to reach us: USA / EUROPE / Locations Not Listed: Motorola Literature Distribution; P.O. Box 5405, Denver, Colorado 80217. 303–675–2140 or 1–800–441–2447 JAPAN: Nippon Motorola Ltd.: SPD, Strategic Planning Office, 4–32–1, Nishi–Gotanda, Shinagawa–ku, Tokyo 141, Japan. 81–3–5487–8488 Mfax: [email protected] – TOUCHTONE 602–244–6609 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, – US & Canada ONLY 1–800–774–1848 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852–26629298 INTERNET: http://motorola.com/sps 16 ◊ MC13155/D MOTOROLA ANALOG IC DEVICE DATA